PEMF Flashcards
High frequency PEMF
Pulsed SWD 27.12 MHz
Pulsed MW 2.45-3.95 GHz
Low power pulsed HF energy
Pulsed SWD with low peak power of 15W
Low frequency PEMF
Low frequency 50-60Hz
Low field strength 1-100 Gauss
Magnetic therapy
Static magnetic therapy or LF PEMF
Continue EME (electromagnetic energy)
Have thermal effect
E.g. Shortwave diathermy
PEME
Athermal effect
Can work with ice pack or hot pack to give thermal effect manually
Ice pack»_space; acute
Hot pack»_space; chronic
(Doesnt matter with moisture)
Different types of electromagnetism
Electric field
Magnetic field
Can make use of one or both field at the same time
PEMF
Pulsed electromagnetic field
Production of low frequency PEMF
Flow of 50 Hz AC through an induction coil
» Produced a pulsed magnetic field at a frequency of 50 Hz
The machine can futher modify the frequency to produce range of magnetic fields of 1-50 Hz
» Distance makes different so make sure locate the Rx area in the middle (most powerful magnetic field)
Electric field is eliminated by the faradic screen
Faradic screen
Use a current of opposite direction to eliminate the AC
Magnetopulse
Device used to produce magnetic field
SI unit
International system of unit
SI unit of PEMF
Measured in field strength
= force acting per unit length of a conductor which carries unit current
T = Tesla (NA-1m-1) 1T = 10000 Gauss or 1000 mT
Strength of magnetic field
Earth’s natural magnetic field (Geomagnetism)
= 0.35-0.7G (Gauss)
» affect human biological clock
PEMF used in PT:
General concepts of PEMF
Human tissue is transparent to magnetic field
Magnetic fields penetrate most metals except Cu and Al
Varying magnetic field induces low frequency electric current in body’s conductors
Different tissues respond to different frequency and intensity
No subjective feeling
Clinical Applicaions of PEMF
Musculoskeletal injuries Arthritis Wound healing Bone healing Peripheral vascular disease Nerve injuries
Therapeutic effects of PEMF
|»_space; Reduces inflammation, reduce chronic swelling
Increase/decrease blood supply to body & legs by changing the diameter of blood vessels (depends on frequentlcy)
Increase the differential leukocyte counts when inflammation occurs
Decrease in E-coli bacteria count
Therapeutic effects of PEMF
|»_space; Reduce pain that is caused by an acute or chronic oxygen deficiency with accumulation of metabolite
Actions:
New blood vessels (re-vascularization) form where needed
Increase in oxygen partial pressure in terminal tissues
Increase local perfusion (vascular permeability) and velocity of capillary flow
Increased oxygen use by all cells in areas treated with PEMF
